diff --git a/accountant/models/accounts.py b/accountant/models/accounts.py
index ceb1467..2db5157 100644
--- a/accountant/models/accounts.py
+++ b/accountant/models/accounts.py
@@ -30,20 +30,24 @@ class Account(db.Model):
     def balances(self):
         """Return the balances of this account."""
         return db.session.query(
-            db.func.sum(Operation.value).label("future"),
-            db.func.sum(
-                db.case(
-                    [(Operation.pointed,
-                      Operation.value)],
-                    else_=0
-                )
+            db.func.coalesce(
+                db.func.sum(
+                    Operation.value
+                ), 0
+            ).label("future"),
+            db.func.coalesce(
+                db.func.sum(
+                    Operation.value
+                ).filter(
+                    Operation.pointed
+                ), 0
             ).label("pointed"),
-            db.func.sum(
-                db.case(
-                    [(Operation.operation_date <= db.func.current_date(),
-                      Operation.value)],
-                    else_=0
-                )
+            db.func.coalesce(
+                db.func.sum(
+                    Operation.value,
+                ).filter(
+                    Operation.operation_date <= db.func.current_date()
+                ), 0
             ).label("current"),
         ).filter(
             Operation.account_id == self.id